Manhole cover



March 18, 1930.

C. N. ELSY MANHOLE COVER Filed Feb. 13, 1928 2 Sheets-Sheet l March 18,1930. c. N. ELSY 1,751,194.

MANHOLE COVER Filed Feb. 15, 1928 2 Sheets-Sheet 2 Patented Mar. 18,1930 UNTTE stars-1s.

IVEPBNHOLE COVER This invention: relates to manhole covers and: hasamong: its objects to 7 providea new and; useful) cover which shallbesimple inoonstnuction, durable and readily installed for manholes in:road pavements.

Aingimportant' obj ect' of: my invention=is to provide a; manhole'coverwhiohshall overcome certain inherent disadvantages-inthe present onknown t'ypeiofmanhole covers. A

10 manhole may be considered as a fixed im-' movable rsupporting columnfor: theicover. It

is: Well known that-concrete. slab pavements settle: and that undercertain heavy; loads,-

suoh as when-:a heavy truck passes-over them; will move relatively tothe: manholecover and! its support, and thus: often cause" displacementbetween the concrete slab pgortions and! the/11131111016 COV6IS;;tllLlScracking the;sla b: portions. around the-manhole covers. I tgistheneforeoneioftheobjectsof inventionvto; provide a1 manhole-cover whichshall bezsuppoirted 1 on the o'oncreteslab and: readi- 1y; movable withit under? loading; or settlement' to: thereby; overcome any relative disr placement between it and the. adjacent 1 conorete-sla'b."

Another object of my invention is tdprovide a. manhole cover withmeansforl af fordingritsdnstallation on the-proper grade level. whichmeans Will support the cover at the: desired. grade level. orv elevationduring thespouringmf-the concrete road slab I around it and yet permititsfree :movement with the slabiunder any; settlement thereof;-

A further object of my; invention is to provide almanhole I cover havinga vframe or collar'fw'ith'i integral means fon supporting: it'onthe'ro'a'd 'slab; I I r I still further objeot of' my invention: isfound in the -provision' ofadju'stahle' means for' supporting? the"-manhole cover frame on a supporting ring di1ringits installation" andtheiponringofthe concrete slabar'ound With the" above and othert'objsets in view, my invention consists-in" the novel combina tion,construction and arrangement" of the parts. and membersnshown in mypreferred embodiment in the attached diawings, de-- scribed. in thefollowing: specifications" and particularly pointed: out. in theappended. claims. I

Referring to the illustrations: Fig. 1,.is a

half elevation and halfverticalsection showing my new and improved;manhole cover.

' F g. 2, is aplan View of the cover.

Figs. 3, a, and 5, are respectively cross sections ofthe cover plate,frame or collar and installationsupporting ring.

7 It will be runderstood that the principles of designherein shown for acover for. a circu lar manhole may be readily adaptedto-manhole coversfor manholes of any other cross sectional formation:

The wall of the manhole is indicatedby numberl"0.

Anannular baseor ring 11' is providedffor mounting: uponthe top-of themanhole wall 10. The ring 11 iszofdl cross section havin gta baseportion 11 and'a vertically disposedintegral wall portionwl-l Suitablestiffening brackets'or. lugs II 'may. becast thereon as shown. Thewa-llfportion l l is formed with suitably spacedholes 111 I The-covercollar or frame- 12 comprises an annular wall1-2 having slots 12thereinsuit ably spaced toregisterwith the holesll 'in the ring: 11 andextendingupwardly, from the lower. edge of: the: frame to a desirablepoint;

The upper edgeofthefframe 12is provided with fa ledge 12 for the coverplate 131 Theupper'portion of the frame 1219 also enlarged to form anannular; rim, or flange 12 It hereben-otedthat the rim: or

flangelQP might be readily modifiedin the for-1n: of segmental lugs orflange extensions of" any; suitable formation whereby? such frame12f1night be suitably supported; upon the concrete road: slab '14: I

In" the;- installation of my improved manhole' cover thering- 1 1 isfirst mounted; in place upon the topof the manhole" wall 10. Bolts 1 5are-then placed in-thehole's-ll with their heads againstthe outsideofthewall portion 11 Then/the frame 12 is inserted within the ring 11withthe slots 12 registering' overthe bolts 15 andwhen the frame 12 isproperly leveled' to' ther'oad grade, it is securely retained in placeby the tightening of the nuts of the bolts 15.

The concrete slab 1 1 may then be placed and when the cement has set,the nuts on the bolts 15 may be loosened as the frame 12 will then besupported by means of its flanged upper end 12 upon the concrete slab.

It will now be-readily apparent that where- ,as the frame 12' isconfined within the ring 11 it is free to go up and down with the slab ll due to the freeengagement'ot thebolts 15 within the slots 1%.

It will also be noted that the collar or -While'the term manhole hasbeen used throughout the above description it is obvious that the sameproblems exist in other structures than those technically known asmanholes, as for instance in catch basins or wherever there is a linedcavity below the paving slab, accessible through an opening in thepaving slab which opening is provided with a trafiic supporting covereither imperforate or in the form of a grid or the like. It is intendedthat the term manhole as used in the claims shall be construedaccordingly.

I claim as my invention:

1. In a structure of the character described, the combination of asurrounding wall structure forming a manhole and containing an openingin its top, a cover-platesupporting hollow member open at its oppositeends and forming a continuation of the opening in said wall structureand free of support by said wall structure, a concrete slab in whichsaid member is located, and means supporting said member on said slab,said member and slab being capable of downward movement as a unitrelative to said wall-structure.

2. In a structure of the character described, the combination ofa'surrounding wall structure forming a manhole and containing an openingin its top, a cover-platesupporting hollow member open at its oppositeends and forming a continuation of the opening in said wall-structureand free of support by said wall structure, a concrete slab in whichsaid member is located, means supporting said member on said slab, saidmember and slab being capable of downward movement asa unit relative tosaid wall structure, and a mass of relatively yieldable material betweensaid slab and thetop of said surrounding wall-structure.

' ring. 3.7 In a structure of the character described,

the combination of a surrounding wall structure forming a manhole, acover-plate-supporting hollow member open at its opposite ends, saidwall structure at its upper end and said member telescoping, and saidmember being free of support by said wall structure, a concrete slab inwhich said member is located, and means supporting said member on saidslab, said member and slab being capable of downward movement as a unitrelative to said wall structure.

4. In a structure of the character described, the combination of asurrounding wall struc ture forming a manhole, an annular positioningring positioned on the upper edge of said wall structure, acover-plate-supporting hollow member open at its opposite ends, saidring and said member telescoping and said member being free of supportby said wall structure or ring, a concrete slab in which said member islocated and vertically spaced from said ring, and means supportingsaidmember on'said slab. t

5, In a structure of the character described, the combination of asurrounding wall structure forming a manhole, an annular positioningring positioned on the upper edge of said wall structure, acover-plate-supporting hollow member open at its opposite ends, saidring and said member telescoping and said member being free of supportby said. wall structure or ring, a concrete slab in which said memberis' located and vertically spaced I from said ring, means supportingsaid member on said slab, and a mass of relatively yieldable materialbetween said slab and said rin 6. In a structure of the characterdescribe the combination of a surrounding wall structure forming amanhole and containing an opening in its top, a cover-plate-supportinghollow member open at its opposite ends and forming a continuation ofthe opening in said Wall structure and free of support by said Wallstructure, a concrete slab surrounding said member, means in which saidmember is located on said slab, said member and slab being capable ofdownward movement rela tive to said wall structure, and meanstemporarily supporting said member during assembly of the slab andmember.

7. In a structure of the character described, the combination of asurrounding wall structure forming a 'manhole, an annular positioningring positioned on the upper edge of said wall structure, acover-plate-supporting hollow member open at its opposite ends, saidring and said member telescoping and said member being free of supportby said .Wall

structure or ring, aconcrete slab in which said member is located andvertically spaced from said ring, means supporting said member on saidslab, and means temporarily supporting said member in fixed position onsaid 8. A manhole cover structure comprising,

in combination, a hollow cover-plate-supporting member open at itsopposite ends, a ring adapted for support by a manhole structure, meansfor anchoring said member in a paving slab and serving as the solesupport of said member in service, and means for temporarily supportingsaid member on said ring during the placing of said slab, saidlast-named means being adapted for release from suppoigting relationafter the placing of said sla 9. A manhole cover structure comprising,in combination, a hollow cover-plate-supporting member open at itsopposite ends, a ring adapted for support by a manhole structure, meansfor anchoring said member in a paving slab and serving as the solesupport of said member in service, and means for temporarily supportingsaid member on said ring during the placing of said slab, said lastnamedmeans being adapted for release from supporting relation after theplacing of said slab and said ring and member being adapted fortelescopic action in service.

In Witness whereof I affix my signature.

CHARLES NORMAN ELSY.

